Check the listing for details. Yaesu FT-991A FT-891 Amplifier interface Relay Buffer Keying and cables. Condition: New. Listed at 89.98 USD. Picture shows the proper 8 pin mini din cable to your radio, RBI-1 and one RCA-RCA cable to your amplifier relay jack.Protect and isolate your Yaesu FT-991(A), FT-891 (and some other YAESU *) series radios amplifier keying circuit! Plugs into "TUN/LIN" jack ---> RBI-1 ---> to your amplifier "RELAY RCA jack" Also works with * (see below) High quality relay box to interface between compatible Yaesu * Radios with an 8 pin mini DIN jack for amplifier keying and will key any amplifier requiring a closure of contacts. Many newer radios can only provide for a small amount of current on the external amplifier keying output. Includes RBI-1 interface and cables from your radio* to your amplifier RELAY jack. Our box will draw